Medium severity5.5NVD Advisory· Published Oct 8, 2021· Updated Jun 17, 2026

CVE-2021-33603

Description

A Denial-of-Service (DoS) vulnerability was discovered in F-Secure Atlant whereby the AVPACK module component used in certain F-Secure products can crash while scanning a fuzzed files. The exploit can be triggered remotely by an attacker. A successful attack will result in Denial-of-Service (DoS) of the Anti-Virus engine.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

WithSecure/Atlantllm-fuzzy
F-Secure/F-Secure endpoint protection products on Windows and Mac. F-Secure Linux Security (32-bit) F-Secure Linux Security 64 F-Secure Atlant F-Secure Cloud Protection for Salesforce and Cloud Protection for Microsoft Office 365v5
Range: All Version

Patches

Vulnerability mechanics

References

www.f-secure.com/en/business/programs/vulnerability-reward-program/hall-of-famenvdVendor Advisory
www.f-secure.com/en/business/support-and-downloads/security-advisories/cve-2021-33603nvdVendor Advisory

News mentions

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